issue 2695/tox4 install command breaking change docs (#2806)

Co-authored-by: James Addison <james@reciperadar.com>
tox-dev · Jan 2, 2023 · d202833 · d202833
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diff --git a/docs/changelog/2695.doc.rst b/docs/changelog/2695.doc.rst
@@ -0,0 +1 @@
+Add breaking-change documentation for empty ``install_command`` values - by :user:`jayaddison`.
diff --git a/docs/faq.rst b/docs/faq.rst
@@ -48,6 +48,9 @@ tox 4 - changed INI rules
   this worked in tox 3, it was never supported officially. Additionally, in the context of a new virtual environment
   this flag makes no sense anyway.
 
+- tox 4 requires the ``install_command`` to evaluate to a non-empty value for each target environment.  In tox 3, an
+  empty value would be substituted for the default install command.
+
 tox 4 - known regressions
 +++++++++++++++++++++++++